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p.2 #7 · p.2 #7 · I need help trying to compare 70-200 F4 and F2.8 with OOF | |
Sophievb wrote:
OK I guess! The jpeg pics don't show as much but if you look at the text on top of the page, the F4 is more defined and more black than the f2.8 . I did not think it should be the case with a glass that costs twice as much! My focus was in the blue star on the ! and I agree, that area looks sharp; what I am talking about is the rest of the image.
I'm not sure what you are complaining about. Both lenses are doing a fine job.
What you might be seeing here is that the f/2.8 lens goes out of focus faster (outside the region of DoF) than the f/4 lens, so the text is a bit blurred. Also you are shooting these lenses close to mfd and DoF is small and it appears these are hand held shots, so a minor change in position can result in a noticeable change in what appears in focus. Try some macro shooting to see what I mean.
You don't buy the f/2.8 zoom expecting it to be any different in IQ to the f/4 IS version, you buy it because you want to shoot at f/2.8 and/or shoot in lower light where the AF should be faster with the larger aperture lens. Wide open the f/2.8 lens will provide much nicer separation of subject and background in many cases, but of course you have to be more careful due to the smaller DoF and choose your composition carefully.
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